Wrench.



T. W. LITTLE.

WRENCH.

APPLICATION FILED JAN. 9. m5.

' Patnted July 9, 1918.

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T. W. LITTLE.

' WRENCH.

APPLICATION FILED JAN. 9. 1915.

1 ,27 1,784. Patented July 9, 1918.

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- :1 snares A THEODORE W. LITTLE, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR TO WALWORTH MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WRENCH.

Specification of Letters iatent.

Patented July 9, 1918.

Application filed anuary 9, 1915. Serial No. 1,450.

wrench or housing can have only a limited movement with relation to each other so that the movable parts will always remain in operative relation and other resulting advantages attained later to be referred to.

The essential object of my invention is to take up and distribute to the best advantage strain put upon the wrench for preventing breakage, twisting or bending of the operating parts and wear thereon.

My invention will be understood by reference to the drawings in which- Figure 1 is a side view of a wrench embodying my invention.

Fig. 2 is a longitudinal section through the working parts thereof.

Fig. 3 is a section on the line 33 of Fig. 2, and

Fig. 4 is a top View of the removable jaw.

Fig. 5 is a side elevation of the wrench in action.

Referring to the drawings, A represents the main shank of the wrench provided at one end with a suitable handle A and at its opposite end with a jaw E fixed to the shank though preferably detachably secured to it by a pin 6- The main shank A is also preferably provided, as is customary, with a lateral projection afiording a shoulder a.

C is the movable shank of the wrench carrying a jaw 0 This shank is notched or threaded as at 0 in the usual manner.

Embracing the shanks A and C and pivoted to the main shank at b is a housing B. This housing is of the usual type and com prises passages separated by a partition 6 and of which passages B is that through which the main shank A extends and B the One through which the movable shank G extends.

Engaging the movable shank and mount-- ed within the housing is an adjusting nut D. The housing has the usual side openings to permit of the nut projecting beyond its sides whereby the nut may be turned upon the threads 0 of the movable shank to adjust its jaw C in relation to the jaw E fixed to the main shank. In connection with the retention of the adjusting nut it will be observed, especially by reference to Fig. 2, that the nut is held within the housing against else than a rotary movement by its fitting within a chamber comprising the recess 0? in the end wall of the housing, the sides of the housing or portions thereof which frame the openings therein, and between the partition 72 in the housing and the shoulder a of the main shank A. I

On the jaw E of the main shank area pair of rigid arms E which extend well over the movable shank and directly abutting the housing in front of the adjusting nut. These arms provide, as will be more fully explained, stops with which the housing has engagement in the operation of the wrench for limiting the rocking movement thereof on its pivot, and take up directly the pressure of the nut and prevent lateral rocking or twisting of the housing with respect to the main shank. The arms are preferably made quite wide and snugly embrace the movable shank whereby they may assist in the lateral support of this shank.

The wrench is shown preferably provided with the usual springs 6 6 attached to the opposite sides of the main shank and bear ing against the opposite inner walls of the passage B of the housing.

The operation is as follows: The normal position of the parts is substantially as shown in Fig. 1. After the jaws have been brought into engagement with the work the ensuing pressure tends, as the jaws bite into the work, to draw the movable jaw forward over the fixed jaw; at the same time the strain tends to throw the movable jaw outwardly away from the fixed jaw and to draw the movable shank out of the housing. The draw upon the movable shank is transmitted to the nut, which draws against the housing, and the resulting tendency is to turn the housing upwardly around its pivotal connection, which turning of the housing is determined or limited by the engagement of the top of the housing with the arms E which operate as stops for limiting the rocking movement of the housing on its pivot. The arms E thus limiting the rocking .inovement of the housing, act also to take up the pressure exerted by the adjusting nut or assist in taking up such pressure 1f the shoulder ais employed. At the time stress is first exerted upon the work the top surface ei ie we e b t e a ms is sist ce idlrectly ithin the line .of stress see ew mo ebl h ithdraw he attend w l r sfl h r sist nce b me e fii f 'te iiie' 1 1? $1 P k 'z 01f he 1 i Theiu'l s E- i gh W911 li d! in we -pi"s$i .i e;o.f he a j sting nut l the sh ll lder a be .ent ifltifly :eliijeinated. rte ledge a i mis rably meme rd i 1:0 proy-ide as much surfiace for taking up the pressure .of'the nut possible. With the shoulder dretainedany tendency for the adjusting nut to'slip oil the shoulder as the hpusip bseeme t ne i P s n d by t arms 51 "Whieh twee i fh 'xcessfiye urnia 3- the s ene a We Pe mitIQ-i a l pe e- I I I B ele iief e dire a d ree be brace the'movable shank and accordingly are especially .efleetiye in preventing lateral twisting of the movable shanh.

What I claim es sl i 1"= .l. Aer

in e we sh theeqmb ea i x with a ma he eerryi s e iew 2 thre eee mova l he rl-ring just a l usleg emb a es aid stream meted to th me sh 12 were es e asieg the l shank and mounted the hous ng, of a pa r of r ie re 0.1% t li i ie e mail an Weedin we v the m 1e shei a d tees bet n h h e ies 1 mm 1 f t 2 wh reb tqlimit the eeki grme e ne t i the home Q1 it .pi re we e k up d re tl the pressur 9? the n in ese ee nd P ent latera r eling 9r wis ng 9f he h ii ieg w th ecs ee t the leesh nk THEQ OBE LITTLE- e h es e Q+ A Ewes, Home? 992 29 21 El i ewe? we: 19? m 9 e fi se each, by addressing he s z eis ieee 91- f ame Wa es-# 1 R- 

